The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2000
Filed:
Dec. 15, 1998
Applicant:
Inventors:
Jenn S Shih, Paramus, NJ (US);
Eduardo T Yap, Franklin Lakes, NJ (US);
John C Hornby, Washington Township, NJ (US);
Bala Srinivas, Hasbrouck Heights, NJ (US);
Assignee:
ISP Investments Inc., Wilmington, DE (US);
Primary Examiner:
Int. Cl.
CPC ...
C08J / ; C08K / ;
U.S. Cl.
CPC ...
524 99 ; 524457 ; 524458 ; 525191 ; 525205 ; 525218 ; 5253294 ; 5253333 ; 528310 ; 5285 / ; 528503 ;
Abstract
This invention relates to an improved free radical polymerization process for directly producing stable vinylpyridine polymer particles in an aqueous suspension and in a high state of polymer purity by effecting the polymerization in the presence of a water soluble suspension agent selected from the group of polyvinyl lactam, a hydroxy-containing polymer, a polyvinyl alcohol and a mixture thereof.